I’m trying to use a slideshow in one of the columns when creating a custom template. I’m looking for the nice slideshow, not the shortcode one. Also I have tried choosing the “single page” and “post from category”, but the preview image is too small, and changing it from the css page stretches the image i9nstead of making the canvas bigger.

I’d appreciate any help.

I’m trying to achieve a slideshow next to a couple of adds similar to this:

Sounds like you’re going have to use a plugin in order to achieve the slideshow you want. You can search for plugin options either using Google or by going to Plugins > Add New and searching for slideshow or sliders.

I have tried several 3rd party sliders, very few work correctly inside the column and none of them are configurable with Woocommerce products or product categories , which means they don’t fit my needs. Is there no other way?

I think you can do that on the template builder. Just add a Column element. On one of the columns, select Direct Text Input and insert the content slider. Now inspect the element of the slider and change some css.